CIS-45 v2 HDR modem: modulation switching

Today I heard the CIS-45 OFDM HDR modem running on 16230.0 KHz on USB around 1410z. More precisely, the heard signals were the two well known CIS-45 waveforms: the 33.33 Baud version (v1) in burst mode and the 40 Baud version (v2) in bistream. The v2 modem camewithadiscretesignal so I decided to record it for later analysis. The signal clearly exhibits the CIS-45 v2 features: baudrate = 40, Sh = 62.5 and BPSK modulation in the channels as in:

I was surprisedby analyzinganother segment of that signal: the modulation in the channels is no more the expected BPSK but pi/4 DQPSK and still running at 40 Baud. So, it seems that the system has the capability to change the modulation mode (from pi/4 DQPSK to BPSK) on-the-fly, mantaining the same baudrate: